Mapbox无法显示设备位置

Question

我有一个带有Mapbox的Fragment，我想在上面显示设备位置。

class SampleMapFragment : Fragment(), PermissionsListener {
private lateinit var binding: FragmentExploreBinding
@Inject
lateinit var permissionsManager: PermissionsManager
private lateinit var mapboxMap: MapboxMap
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
Mapbox.getInstance(requireContext().applicationContext, getString(R.string.mapbox_token))
}
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
if (!::binding.isInitialized) {
binding = DataBindingUtil.inflate(
inflater,
R.layout.fragment_explore,
container,
false
)
binding.lifecycleOwner = this
binding.mapView.onCreate(savedInstanceState)
setUpMap()
}
return binding.root
}
private fun setUpMap() {
binding.mapView.getMapAsync { mapboxMap ->
this.mapboxMap = mapboxMap
mapboxMap.setStyle(Style.MAPBOX_STREETS) { loadedMapStyle ->
starLocationTracking(loadedMapStyle)
}
}
}
private fun starLocationTracking(loadedMapStyle: Style) {
if (!PermissionsManager.areLocationPermissionsGranted(requireContext())) {
permissionsManager.requestLocationPermissions(requireActivity())
return
}
initLocationComponent(loadedMapStyle)
}
private fun initLocationComponent(loadedMapStyle: Style) {
val customLocationComponentOptions = LocationComponentOptions.builder(requireActivity())
.elevation(5f)
.accuracyAlpha(.6f)
.accuracyColor(Color.RED)
.build()
val locationComponentActivationOptions = LocationComponentActivationOptions.builder(
requireActivity(),
loadedMapStyle
)
.locationComponentOptions(customLocationComponentOptions)
.build()
mapboxMap.locationComponent.apply {
activateLocationComponent(locationComponentActivationOptions)
isLocationComponentEnabled = true
renderMode = RenderMode.COMPASS
cameraMode = CameraMode.TRACKING
}
}
override fun onExplanationNeeded(permissionsToExplain: MutableList<String>?) {
// TODO some explanation can be shown here
}
override fun onPermissionResult(granted: Boolean) {
if (granted) mapboxMap.getStyle { loadedStyle -> starLocationTracking(loadedStyle) }
//else TODO some explanation can be shown here
}
fun onMapBoxRequestPermissionsResult(
requestCode: Int,
permissions: Array<out String>,
grantResults: IntArray
) = permissionsManager.onRequestPermissionsResult(requestCode, permissions, grantResults)
override fun onStart() {
super.onStart()
binding.mapView.onStart()
}
override fun onResume() {
super.onResume()
binding.mapView.onResume()
}
override fun onPause() {
super.onPause()
binding.mapView.onPause()
}
override fun onStop() {
super.onStop()
binding.mapView.onStop()
}
override fun onDestroy() {
super.onDestroy()
releaseMapResources()
releasePermissionsManagerListener()
}
private fun releaseMapResources() {
binding.mapView.onDestroy()
}
private fun releasePermissionsManagerListener() {
permissionsManager.listener = null
}
override fun onSaveInstanceState(outState: Bundle) {
super.onSaveInstanceState(outState)
binding.mapView.onSaveInstanceState(outState)
}
override fun onLowMemory() {
super.onLowMemory()
binding.mapView.onLowMemory()
}
}

我用2个实际设备和1个模拟器测试了上面的实现。该解决方案适用于Android 10设备。用户位置被找到，即使在关闭定位服务并在地图后再次打开它之后，也是可见的。

但在尝试安卓9和安卓7设备时，有时找不到位置，有时需要很长时间，甚至在地图可见之前，位置服务就已经准备好了。

这里可能有什么问题？如有任何帮助，我们将不胜感激。

Answer 1

"但有时找不到位置，有时需要很长时间，甚至定位服务在地图可见之前就已经准备好了尝试使用Android 9和Android 7设备。">

这听起来像是设备试图从GPS传感器获取位置，但需要很长时间才能检索到。随着更新的设备和Android 10的本地化得到了改进，所以这可以解释你看到的情况。

为了了解发生了什么，我建议实现Android FusedLocationProvider，并将其行为与Mapbox SDK(locationComponent(封装的行为进行比较。

此外，请检查您使用安卓10获得的"快速"位置是否真的是从GPS传感器中检索到的，或者它是否"只是"安卓缓存的最后一个已知位置。